Sandstone
Clastic Sedimentary Rock (composed primarily of Quartz, SiO2)
sedimentary
Category
Metamorphic Rock (Composed Of Multiple Minerals)
Browse metamorphic rock (composed of multiple minerals) specimens identified by the Rock Identifier community.
Learn about Metamorphic Rock (Composed Of Multiple Minerals) in the encyclopedia
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Quartzite
Quartzite (chiefly SiO2)
metamorphic
Granite
Granite
igneous
Quartzite with Hematite
Metamorphosed Quartz Sandstone (SiO2 with Fe2O3 inclusions)
metamorphic
Granite Cobble
Granite (composed primarily of Quartz, Alkali Feldspar, and Plagioclase)
igneous
Serpentine
Serpentine-group ((Mg,Fe,Ni,Al,Zn,Mn)3(Si,Al,Fe)2O5(OH)4)
metamorphic
Quartzite
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Quartz (specifically Milky/Gray Quartz)
Silicon Dioxide (SiO2)
mineral
Gneiss
Gneiss
metamorphic
Moqui Marble (Ironstone Concretion)
Goethite/Hematite Concretion (Fe2O3 / FeO(OH))
sedimentary
Quartz / Calcite Vein Rock
Silicon Dioxide (SiO2) or Calcium Carbonate (CaCO3)
mineral
Sandstone (likely Graywacke or Lithic Arenite)
Clastic sedimentary rock predominantly composed of silicate grains
sedimentary
Orange Quartzite (River Pebble)
Quartzite (SiO2 with iron oxide inclusions)
metamorphic
Schist
Mica Schist (primarily Muscovite or Biotite sheet silicates)
metamorphic
Fire Agate
SiO2 (Silicon Dioxide with Iron Oxide inclusions)
mineral
Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral
Orthoclase Feldspar
KAlSi3O8 (Potassium Aluminum Silicate)
mineral
Chalcedony or Chert/Jasper with secondary mineral staining
SiO2 (for chalcedony/quartz) with possible secondary copper minerals (e.g., CuSiO3·nH2O for chrysocolla, Cu2(CO3)(OH)2 for malachite) or iron oxides/hydroxides.
Mineral, potentially a rock with chalcedony/jasper.
Basalt
Basalt (Mafic Volcanic Rock)
igneous
Gneiss with Quartz/Feldspar Vein
Quartz-Feldspathic Gneiss
metamorphic
Quartzite River Rock (with iron staining)
Metamorphosed Sandstone (SiO2)
metamorphic
Zebra Rock / Zebra Marble
Banded Limestone-Marble Transition
metamorphic
Mica Schist
Mica Schist (Composition typically includes Muscovite KAl2(AlSi3O10)(OH)2 and Quartz SiO2)
metamorphic
Sandstone
Arenite (composed primarily of Quartz: SiO2)
sedimentary
Limestone
Sedimentary rock composed of Calcium Carbonate (CaCO3)
sedimentary
River Stone (likely Quartzite or Chert)
Sedimentary rock composed of Silicon Dioxide (SiO2)
sedimentary
Carved Mottled Greenish-Yellow Crystal/Glass Object
Unknown; possibly a form of quartz (chalcedony/jadeite/nephrite) or glass/resin.
Man-made Object/Uncertain Mineral
Sandstone
Arenite (composed primarily of SiO2, or Silicon Dioxide)
sedimentary
Chert (Nodule)
Chert (composed of Microcrystalline Silica/SiO2)
sedimentary
Greenstone (Altered Mafic Rock)
Greenschist / Meta-basalt
metamorphic
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Chalcedony (Botryoidal)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
mineral
Earth
Terra / Earth
igneous, sedimentary, and metamorphic
Graphite-veined Quartzite
Meta-sedimentary Quartzite with Carbonaceous/Graphitic Inclusions (SiO2 + C)
metamorphic
Epidote
Epidote - Ca2(Al,Fe)3(SiO4)3(OH)
metamorphic
Labradorite (a variety of Feldspar)
Labradorite; (Na,Ca)(Al,Si)4O8 (a plagioclase feldspar)
igneous
Dragon Blood Jasper
Epidote with Red Jasper inclusions (SiO2 and Ca2(Al,Fe)3(SiO4)3(OH))
metamorphic
Quartz in Matrix (possibly with Biotite or Hornblende)
Quartz (Silicon Dioxide, SiO2) in Granitic Matrix
igneous
Sandstone (Ferruginous)
Arenite (composed primarily of SiO2 with Fe2O3 cement)
sedimentary
Quartz (likely Jasper or Chert variety)
Quartz (SiO₂)
Mineral
Seraphinite (Clinochlore)
Clinochlore (Mg,Fe2+)5Al(Si3Al)O10(OH)8
mineral
Gneiss
Gneiss
metamorphic